Title: How to use anti-aliasing
procedure Antialiasing(Image: TImage; Percent: Integer);
type
TRGBTripleArray = array[0..32767] of TRGBTriple;
PRGBTripleArray = ^TRGBTripleArray;
var
SL, SL2: PRGBTripleArray;
l, m, p: Integer;
R, G, B: TColor;
R1, R2, G1, G2, B1, B2: Byte;
begin
with Image.Canvas do
begin
Brush.Style := bsClear;
Pixels[1, 1] := Pixels[1, 1];
for l := 0 to Image.Height - 1 do
begin
SL := Image.Picture.Bitmap.ScanLine[l];
for p := 1 to Image.Width - 1 do
begin
R1 := SL[p].rgbtRed;
G1 := SL[p].rgbtGreen;
B1 := SL[p].rgbtBlue;
// Left
if (p 1) then m := Image.Width
else
m := p - 1;
R2 := SL[m].rgbtRed;
G2 := SL[m].rgbtGreen;
B2 := SL[m].rgbtBlue;
if (R1 R2) or (G1 G2) or (B1 B2) then
begin
R := Round(R1 + (R2 - R1) * 50 / (Percent + 50));
G := Round(G1 + (G2 - G1) * 50 / (Percent + 50));
B := Round(B1 + (B2 - B1) * 50 / (Percent + 50));
SL[m].rgbtRed := R;
SL[m].rgbtGreen := G;
SL[m].rgbtBlue := B;
end;
//Right
if (p Image.Width - 2) then m := 0
else
m := p + 1;
R2 := SL[m].rgbtRed;
G2 := SL[m].rgbtGreen;
B2 := SL[m].rgbtBlue;
if (R1 R2) or (G1 G2) or (B1 B2) then
begin
R := Round(R1 + (R2 - R1) * 50 / (Percent + 50));
G := Round(G1 + (G2 - G1) * 50 / (Percent + 50));
B := Round(B1 + (B2 - B1) * 50 / (Percent + 50));
SL[m].rgbtRed := R;
SL[m].rgbtGreen := G;
SL[m].rgbtBlue := B;
end;
if (l 1) then m := Image.Height - 1
else
m := l - 1;
//Over
SL2 := Image.Picture.Bitmap.ScanLine[m];
R2 := SL2[p].rgbtRed;
G2 := SL2[p].rgbtGreen;
B2 := SL2[p].rgbtBlue;
if (R1 R2) or (G1 G2) or (B1 B2) then
begin
R := Round(R1 + (R2 - R1) * 50 / (Percent + 50));
G := Round(G1 + (G2 - G1) * 50 / (Percent + 50));
B := Round(B1 + (B2 - B1) * 50 / (Percent + 50));
SL2[p].rgbtRed := R;
SL2[p].rgbtGreen := G;
SL2[p].rgbtBlue := B;
end;
if (l Image.Height - 2) then m := 0
else
m := l + 1;
//Under
SL2 := Image.Picture.Bitmap.ScanLine[m];
R2 := SL2[p].rgbtRed;
G2 := SL2[p].rgbtGreen;
B2 := SL2[p].rgbtBlue;
if (R1 R2) or (G1 G2) or (B1 B2) then
begin
R := Round(R1 + (R2 - R1) * 50 / (Percent + 50));
G := Round(G1 + (G2 - G1) * 50 / (Percent + 50));
B := Round(B1 + (B2 - B1) * 50 / (Percent + 50));
SL2[p].rgbtRed := R;
SL2[p].rgbtGreen := G;
SL2[p].rgbtBlue := B;
end;
end;
end;
end;
end;
//Example:
procedure TForm1.Button1Click(Sender: TObject);
begin
Antialiasing(Image1, 80);
end;